Throttle-valve



R. W. CLIFFORD ANDP. J. NICHOLS.

THROTTLE VALVE- APPLICATION FILED 0cT.2,1sr'9.

Patented Apr. 27, 1920' I 2 SHEETS-SHEET I.

WITNESSES:

KEWC ZiffiZdJINI/ENTORS R. W. CLIFFORD AND P. J. NICHOLS.

THROTTLE VALVE.

APPLICATION FILEU 0CT.2,19I9.

1,338,489; Patented Apr. 27, 1920.

2 SHEETS-SHEET 2.

I To all whom it may concern UNIT sT TEsPATEnT OFFICE;

ROGER w. cmrnonn AND PHILIP .1. NII'GHOLS, oi s'oHENEcrAnY, NEw Yoax.

THROTTLE-VALVE.

. Application inlet] October 2,

Be it known that we, ROGER W. CLIFFORD and PHILIP J NioHoLs, both of Schenec v -tady,'in the county of Schenectady and State of New York, have jointly invented a certain new and useful Improvement in Throttle- Valves, of which improvement the following is a specification. e w l Our invention relates to means for con trolling the flow of'fiuids, and more particularly to single seated throttle valves of'the balanced type for v locomotive engines, although not limited in application thereto,

- The object of the invention'is to pr'ovido a valve of the abovetype which shall em body the advantages of simplification of con struction, reduction of compass, and pro motion of the unobstructed flow of steam when unseated.

The improvement claimed is hereinafter fully set forth. t 1

In the accompanying drawings: Fi re 1 is a vertical" central section throu'g a throttle valve, illustrating an embodiment of our invention, the valve being shown as, seated; Fig. 2, a view, the upper half of which is a horizontalsection through the hood, with the valve removed, taken on the line a a of Fig. 1; Fi 3, a vertical'central' section, taken at a rlght angle to Fig. 1, the valve being shown as unseated; Fig. 4:, a similars'ection, illustratin a structural 5, a horizontal sec tion, on the line b b 0 Fig. 4. t

In single seated throttle valves of. the

, balanced type, the balancing piston is usu ally' madea part of the 'main valve and lo-" cated' within a balancing chamber.- In pass ing a valve of such construction, thesteam necessarily passes through and around the q balancing chamber, and .1s th'ereby deflected at sharp angles, andits flow impeded. The

: balancingphamber is, ofcourse, larger than the main valve, and, by-reason'of its weight and the machining of its finished surfaces, "it becomes one. ofj'the mostjfc'ostly members, of [the complete valve structure, The 'ob-" jec'tions above 'noted will be found'to' be 3 elimina'ted by'jourimprovement herein set forth 1 V "In the practice ofour invention, refer-. .f ring descriptively to the specific embodi- Specification of Letters Patent.

.or by suitable packing.-

1919. Serial no; 327,949.

ment thereof which is herein exemplified,

;which,-in this instance,- is secured, detachably, by bolts, 1,a1id nuts, to the top of the f stand pipe, 2, through which steam "passes from 'theboiler to the cylinders of a locomotive, the joint between the hood and pipe being made steam tight by grinding responding in diameter with the inside of the stand pipe, is formed inthe bottom of the hood, and a beveled or; conical valve seat, 1*, is machined at'the top of said open- While the hood is herein shown as --formed v separately from, and deta ehably' 11 opening, c0r- Patented Apr. 27, 1920.

connectedEftx), the stand pipe, it may, if ,pre-qf ferred, be cast integral therewith,- its func' tions being to provide aguide for the throttle valve lnthe trave r ses. of 'the latter, and to enable steam to be taken at the levelofth'e steam domelof the-boiler. p

' A cylindrical throttle valve, 3, of the puppet type, which is boredout truly on its inner surface, is fitted to seat upon the valve seat, 1", and thereby to' control the passage 1 of steam, through the hood, from the boiler to the stand plpe. The throttle valve is raised and lowered, from and to its seat,

by connections to any suitable known valve highest operating mechanism, which .does not, in and of itself, 'form part of our invention,

and is'not', therefore, herein set forth. The valve. operating mechanism is connected to apair o-f-vertical rods, 4, 41, to' the upper ends of which there is secured, a .cross head,

'5, which is coupled by a pin, 5, to the upper-'- end of a valve stem, 6, connected, with the capacity of a limited degree ofrelative movement, to "the, throttle valve, 3. The periphery of'the throttle valv'ecarries annular flanges, 3*, fittingagainst vertical ribs, 1, .on the. wall of the hood, said ribs serving to guide: the 1 valve in its traverses toward and from its seat,

A' cover plate, 3?, closes the throttle valve at its top, and is detachably secured to it, by flstuds, 3, a. ground- -joint,being'made be- Itween the cover plate-and.valve, to, revent leakage ofnsteam} into the latter.- he in-' teri'o'r of. the throttle valve constitutes a balancing chamber, in which is neatly fitted W a balancing piston,'.7, which is provided,-

. with water grooves or Suitable packing on its periphery, in order to make a tight joint I v g face formed around the bottom'of'the balchamber. When the throttle valve is seate v with the wall of the inclosing balancin as shown in Fig.- 1, the balancing piston abuts against the bearing lugs, 2, on the inside of the stand pipe, and when the valve is unseated, as shown in Fig. 3, it rests on shoulders, 3, on the wall of the balancing chamber.

The valve stem, 6, which passes freely, through the throttle valve and balancing,

piston, and is, as before stated, coupled to the cross head, 5- has, formed upon or se-. cured rigidly to 1t, apilot valve, 8, of the beveled face puppet type, which' is fittedto seat upon a correspondingly formed face surrounding an opening I in the cover plate 3", and thereby to control the admission 0 steam from the hood to the balancing cham-' ber. The upward or unseating'movement of the pilot valve, independently, of the throttle valve, is limited by a 'tappet, in the form of a nut, 6, screwed upon the valve, stem, 6,- and adapted'to abut against a bearing on the inner side-of the cover plate. The valve valve remaining on its seat, againstwhich it I is held by the ressure. of the steam on thecover plate. aw valve admits steam, from the boiler and" stem and pilot valve are guided between lugs, 6", on the coveiplate, which also serve as an abutment for the nut, 6; 1

In operation, the upward movement of the valve stem, 6, eflected by the actuation.

of the "operating mechanism for .the purpose -of unseating the throttleval e, preliminarily unseats the pilot valve, the throttle he unseating of the pilot hood, into .thebalancing' chamber, in which its pressure acts downwardly upon the bal ancing piston, thereby holding it against the lugs, .Zj, and upwardly, with the, same force,

agalnst the cover plate of the throttle valve.-

Equilibrium of pressure being'thus instituted, on the opposite sides of the cover plate, the connected throttle valve is consequentlybalanced, and by the -further'movement of the valve stem, resultant' upon it c contact of the tappet, 6*, withthelugs on the cover plate, it' may be. raised through the the throttle valve. i I I The's'tructuralmodification illustrated inv I full extent of its traverse,,.withoutop'position by steam pressure resistance. The balancing" piston being also balanced, is raised by and with the throttle valve, into the ponormal position, in and, by the seating of Figs. 4 and 5, accords, in all fundamental features of construction and operation, with the appliance shown in Fi .'1 to 3 inclusive and above described, di ering therefrom principally in the particulars that a stationhaving vertical guide 1';

ar balancin iston is, in this instance, ap-

y g P plied instead of a movable piston, as in the formerv one, and the throttle valve seats'on a Y connected plate, and the balancing piston 'is fitted with a packing ring, 7 instead of hav-' ing water grooves, as mthe formercase.

The balanc ng piston, 7 is, in this instance, I

formed integral with, or secured to, a subjacent valve seat ring, .9, which is secured,'

by bolts, 9', to the top of the stand pipe, the

'therebyfixed balancing piston, fittin truly in thebalancing chamber within the t rottle valve; A conical face, 9', formed on the ilot valve, 8, is raised and lowered, from and the manner herein-before described.

We claim as our inventionand desire-to secure by Letters Patent:

,' 1.- The combinationof an open-topped stand pipe;- a throttle valve, seating at the top of said-pipe and having an internal cy lindrical balancing. chamber? a balancing piston fitted in said chamber; and means for instituting-equilibrium of pressure, in

thebalancing-chamber, on'said piston and ,on the throttlevalve.

to its seat, in I "periphery of the top of the valve seat ring, .9, constitutes theseat of the throttle valve,

I 3, which, with the associated 2. The combination of an open topped stand pipe; a' throttle valve, seating at'the top of said pipe and having. aninternal cylindrical balancing chamber; a balancing piston fitted in said chamber; a pilot valve controlling the admission, of steam into said.

chamber; and means .for successively unseatingsaid pilot .valve andthe throttle valve.

3. Thecombination of an open topped i stand pipe; a throttle valve, seating at the top of'said' pipe, and having an internal cylindrical balancing chamber; a balancingpiston fittedin said chamber; a-pilot valve controlling theadmission ofsteam into said chamber a valve stem carrying said valve and passing. freely through the throttle valve and balancing piston; a tappetfixed on said stem, in position-to abut a 'ainst the top of said pipe, and having an internal cylindrical balancing chamber; bearing lugs 1 at the lower end'of said chamber; a balancing piston fitted-in said" chamber'and normally resting on said In hood surrounding th rottle valve; and

. 'throttle-valvewhen the pilotva ve' is unseated; and means for imparting vertical movement to the valve stem,

sition shown in Fig. 3, and is returned to its 0 1 an open topped I m Dig the periphery of the throttle valve; a pilot valve convalve and passing freely through the throttle valve and balancing piston; a tappet fixed on said stem, in position to abut against v the throttle valve When the pilot valve is I unseated; and means for imparting vertical movement to the valve stem.

ROGER W. CLIFFORD.

PHILIPYJ. NICHOLS. Witnesses: E. I. SoHAUBEmf J HOWARD WAGAR. 

